Associate extra scalar data field with mesh or pointcloud
I have edited the import script so you can get extra info from the file as vertex weights with a factor as object property
ex : temperature info column will generate

vertex_group named 'temperature'
object property named 'temperature_factor'
point temperature = vertex_weight*temperature_factor

download this file (  import_ply.py  ) and replace the one in Program Files\Blender Foundation\Blender\2.73\scripts\addons\io_mesh_ply\ , restart blender after that to take effect

I have used the factor to normalize all values (0.0&lt;-&gt;1.0) because weight can't handle more than that